Hi, folks. I’m renewing my interest in older, traditional slipjoint knives. I have a good, basic understanding of techniques for removing gunk and rust from blades, but I’m hoping you can help me with info on cleaning shields attached to the covers. If there is rust and perhaps what looks like peppering on a shield, would attempting to remove these risk discoloring the shield? I’m interested in this for application to all brands as I seek out knives but at the moment specifically looking at a Schrade USA era knife available online that looks nice except for a couple of dark spots on the shield. Please let me know your thoughts on this. Thanks to all.